Pipe-bending machine



Juiy E3 F HILGERS 1,919,39

PIPE BENDING MACHINE Filed Feb. 5, 1931 2 Sheets-Sheet l 1933 F. HILGERSY 1,919,839

PIPE SENDING MACHINE Filed Feb. 5, 1951 2 Sheets-Sheet 2 Patented July 25, 1933 Nl'l E fi STATES- FRANZ HILGERS, OF RODENKIRCHEN, GERMANY PIPE-BENDING MACHINE Application filed February 5, 1931, Serial No. 513,728, and in Germany March 2, 1930.

This invention relates to pipe-bending to the other side of the bending block, the

machines, and more particularly to the pipe guide thereon.

in shaping long, heavy pipes for different uses, it often becomes necessary to form one or more right and left hand bends in a single pipe and the various angularly arranged portions of the shaped pipes not infrequently lie in different planes. This makes desir-able the ability to form both right and left bends in a pipe with as little movement of the pipe relative to the bending machine as possible. To accomplish the desired shaping of the pipes on bending machines of the prior art, it is necessary that the pipe guide should be taken off and replaced on the other side of the bending block. As there are pipe guides of considerable length-e. g. 6 to 7 metres-cranes are necessary for removing the pipe guide from one side and placing it on the other. In the devices in which there is fitted on the pipe guide a slide piece which is naturally firmly connected with the pipe guide, on bending 2a to another side the slide piece must be taken oil and, after the pipe guide has been turned over, must be re-fixed on the other side of the guide or carrier.

The subject matter of this invention is an arrangement which obviates this troublesome mode of operation and allows the turning over of the guide, and, if required, of the slide piece, to be effected without much dismantling. To this end, the guide has, on the body of the pipe-bending machine, a plurality of supporting and pivoting points which are arranged one behind the other in such a manner that they lie on the longitudinal medial line passing through the pivots of the bending block, and that, in this way the angle of the guide can be made to correspond to the radius of curvature of the particular bending block employed.

According to the invention, the guide, which can at the same time serve as carrier for the pipe, is rotatable in its fixing device about its longitudinal axis, so that in this way the slide piece or other resting piece for the pipe to be bent is no longer required to be taken off, but, when the guide is applied whole can, after loosening the fixing device, be rotated in the fixing device about the longitudinal axis.

In another embodiment of the invention, the fixing device, as carrier for the guide, is provided with a ball and socket joint or Cardan joint, so that the guide can be shifts ed and rotated longitudinally in its fixing device, but it can also be raised and lowered. so By means of this arrangement it is in many cases possible to obviate the drawing back of the carrier or the guide when the other side of the bending block must be used.

The invention is illustrated by way of example in the accompanying drawings, in which Figure 1 is a plan of the bending machine showing the guide and support partly in section, '10

Figure 2 shows another example of guide, partly in plan and partly in section,

Figure 3 is a front view of the carrier,

Figure 4 is a side View of the carrier shown in Figure 3, Figure 5 is a section on the line 5-5 of Figure 1, and

Figure 6 is a section on the line 66 of Figure 2.

The table of the pipe bending-machine carries the usual bending block a as well as the appurtenant clamping device and an extension piece m containing the openings for a pivot z for the fixing device h. A slide piece carrier consists of the part t, which may, for example, be tubular or even rail shaped, and to which is secured the slide piece f, which serves as a rest and guide for the pipe to be bent and the mandrel located therein.

If the device is to be used for bending the pipe to the right, a screw in ears '0 that connects the slide piece carrier t with the pivot z of the fixing device is loosened, and the carrier t, with the slide piece f fixed thereon, can now be drawn back and the whole swung about the pivot z; the connection between the carrier 16 and the slide piece f must be loosened and then tightened on the opposite side of the carrier t. Thereupon, the carrier t with the slide piece f are tilt pushed forward into the correct position on the right-hand side of the bending block, the screw in ears 7) is tightened, and bending can now be commenced.

In one embodiment, the fixing device h, in which the carrier t lies, is so constructed that the carrier t is rotatable therein about its longitudinal axis. In this way it is rendered superfluous to loosen the connection between the slide iece f and the carrier t; it is therefore su cient, during the swinging over, to draw the carrier t back and to rotate it about its longitudinal axis, then to push it back again and apply it to the other side of the bending block.

In the embodiment of the invention shown in Figure 2, the carrier 25 lying in the fixing device It is of such a size that there is room therein for the pipe 1* to be bent including the mandrel and mandrel rod. The slide and guide piece f for the pipe can then be omitted because the carrier t takes over these functions. In order to make the device usable for the difi erent diameters of pipes to be bent, the upper part of the carrier t may be made removable, and the carrier can be adapted to the diameter of the pipe r to be bent, by fitting on a corresponding y formed upper end part.

Further, to obviate also the drawing back of the carrier, the head of the pivot 2 can be constructed as a Garden joint, or ball and socket joint g, and since, in such a pipebending machine, it is unnecessary to mount the'pipe to be bent or the mandrel rod and the carrier rigidly towards the rear end, the pivot 2 can also be used as point of support for lifting the carrier and mandrel, to swing it away over the bending block and then to apply it to the other side of the bending b ock.

As may be seen in the case of the arrangement described, the pipe-bendin machine is itself the carrier, not only of t e bending block, but also of the pipe and of the mandrel with its mandrel rod; thus none of the implements employed in the bending operation are fixed outside the pipe-bendin machine.

IVhat I claim as new is 1. In a pipe bending machine including a table, a bending block pivoted on the table, an extension on the table, a guide for the pipe to be bent, a fixing device movably connected to the said extension, and a carrier for said guide adjustably connected to the fixing device.

2. In a pipe bending machine including a table, a bending block pivoted on the table, an extension on the table, a guide for the pipe to be bent, a tubular fixing device mounted for universal movement on said extension and means for carrying said guide adjustably connected to said tubular fixing device.

FRANZ HLGERS.

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